A lunar eclipse occurs when the Earth's shadow falls on the moon. Lunar eclipses occur, on average, about every 6 months.

月食的发生，是由于地球的影子落在月球上。月食发生的频率平均是6个月一次。

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The astronomers, at Spain's Institute of Astrophysics of the Canary Islands, made their observations on 16 August 2008 during a lunar eclipse — in which the Moon moves into Earth's shadow.

地处加纳群岛的西班牙天体物理研究所里，天文学家在2008年8月16日发生日食期间了进行观察。 期间，月球移到地球的阴影中。

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A lunar eclipse occurs when the Earth's shadow falls on the moon.

月食的发生，是由于地球的影子落在月球上。

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This was when it was first pointed out that, because sunlight near the lunar poles comes in at a shallow angle, the floors of the deeper craters there might be in permanent shadow.

ECONOMIST: Creative destruction